Submission #436552

#	Time	Username	Problem	Language	Result	Execution time	Memory
436552		qwerasdfzxcl	Unscrambling a Messy Bug (IOI16_messy)	C++14	100 / 100	3 ms	512 KiB

messy

#include <bits/stdc++.h>
#include "messy.h"

using namespace std;
typedef long long ll;
vector<int> ans;
int n;

void dnc_write(int l, int r){
    if (r-l<=1) return;
    string s;
    int m = (l+r)>>1;
    for (int i=0;i<n;i++){
        if (i<l || i>=r) s.push_back('1');
        else s.push_back('0');
    }
    for (int i=l;i<m;i++){
        s[i] = '1';
        add_element(s);
        s[i] = '0';
    }
    dnc_write(l, m);
    dnc_write(m, r);
}

void dnc_read(int l, int r, vector<int> x){
    if (r-l<=1){
        ans[x[0]] = l; return;
    }
    string s(n, '1');
    for (auto &y:x) s[y] = '0';
    vector<int> L, R;
    for (int i=0;i<r-l;i++){
        s[x[i]] = '1';
        if (check_element(s)) L.push_back(x[i]);
        else R.push_back(x[i]);
        s[x[i]] = '0';
    }
    int m = (l+r)>>1;
    dnc_read(l, m, L); dnc_read(m, r, R);
}

vector<int> restore_permutation(int N, int w, int r) {
    n = N;
    ans.resize(n);
    dnc_write(0, n);
    compile_set();
    vector<int> tmp;
    for (int i=0;i<n;i++) tmp.push_back(i);
    dnc_read(0, n, tmp);
    return ans;
}

• Subtask 1: 20 / 20
• Subtask 2: 18 / 18
• Subtask 3: 11 / 11
• Subtask 4: 21 / 21
• Subtask 5: 30 / 30